Telegraph recorder control



'IHIIIIL ONE. 24, 1944. WATSQN 2,361,073

TELEGRAPH RECORDER CONTROL Filed Nov. 9, 1943 rn mc ash-RE I sascron I MAGNET F 7:11 -/2 T MANUAL FEED OUT KEY L540: r0 v 0mm MACHINES L LETTERS :/0/v4L l I v 'GENEI-MTOR FOR anouP 0F jAMCH/NES i lNl/E/VTOR By E. F -WA7'S0/V ATTORNEY Patents Oct. 24, 1

omen STATES PATENT OFFICE TELEGRAPH RECORDER CONTROL Edward F. Watson, Larchmont, N. Y., asslgnor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application November 9, 1943, Serial No. 509,540

(Cl. 178-92). I

-properly respond to the succeeding code combi- 2 Claims.

This invention relates to telegraph systems and more particularly to circuits for cooperating with a receiving recorder such as a reperforator, typing reperforator or other type of receiving instrument.

In telegraph receiving instruments which record received signals on a recording medium, it is frequently desirable to permit an operator or attendant to advance the recording medium through the receiving instrument or reperf-orator while no signals are being received and at the same time prevent or interrupt such advancing of the recording medium through the receiving instrument upon the reception of received signals.

Numerous attempts have been made in the past to provide various arrangements for accomplishing these results. vide a special magnet or other equipment for controlling the receiving instrument to cause it to advance the recording medium through it independently of the receiving selector magnet. Such arrangements require special recorders and are not applicable to existing instruments.

Another proposal has been to provide an auxiliary signal generator for generating predetermined signals which, when connected to the selector ma net. will cause the receiving device to advance the recording medium therethrough. In the latter type of circuit arrangement and in certain of the first-mentioned types, dificulty has been experienced in interrupting the operation of the feed-out mechanism upon the reception of signals because of the various phase differences between the received signals and the auxiliary source ofsignals. In the past it has been necessary to transmit severalletters signals to the receiving instrument in order to insure that it will be in proper condition to receive the succeeding signals.

In addition, it other than letters signals are transmitted preceding the message with the systems of the prior art, additional signals will be required to insure that the receiving instrument will respond in synchronism to the received signals. In other words, a greater plurality of signals will be required in order to insure proper reception of the succeeding message.

It is an object of the present invention to overcome the dimculties experienced with the systems in the prior artas outlined above.

A feature of the; present invention relates to a slow-release relay which maintains the circuit of the'selectormagnet closed for substantially a character length following the reception of the start pulse of the first received signal. By providing this relay, the character of the first code combination is immaterial. In addition, by causing the circuits to respond to the start pulse of this signal, it is possible to insure that the selector mechanism will be in a proper condition to nation.

The foregoing objects and features, as well as other objects andfeatures in the present invention, the novel features of which are set forth in the claims appended hereto, may be more read- 11y understood by reference to the attached drawing which shows an exemplary embodiment of the present invention arranged for cooperation with a typing reperiorator mechanism.

Referring now to the drawing, ii represents 7 a typing reperforator of the type such as disclosed It has been proposed to proin an application of Bacon et aL, Serial No. 383,490, filed March 15, 1941. It, of course, will be understood by those skilled in the art that any other suitable type of recording instrument suitable for recording telegraph signals may be employed in place of the typing reperforator such as disclosed in the above-identified application of Bacon et al. However, in accordance with the present invention, it is unnecessary to use the special magnet or to equip such a reperforator with the special magnet disclosedin that application for causing the mechanism to advance the tape out of the machine.

The selector magnet i2 is the only magnet required to control the reperforator H in order that it will properly cooperate with the communicating circuits of the exemplary embodiment of the invention disclosed herein. Normally. the line relay ill follows signals received over line L and repeats them to the selector magnet it through the break contacts of relay it. This operation of the receiving relay l0 and the selector magnet I2 is well understood by persons skilled in the art and causes the corresponding signals or symbols to be recorded on the tape or other recording medium of the receiving device I I.

In order to permit the operator or attendant I to cause the receiving device II to advance the recording medium through it and thus advance the end of the last message out of it so'that the entire message may be readily detached or else transmitted from an associated transmitter, a manual feed-out key N has been provided. If key I6 is operated during the time signals are being received, it will complete a circuit for the operation of relay l5 from battery through the break contacts of relay IS, the operated contacts of key It to ground through the winding of relay I5. Relay l6, however, is a relay which is slow to operate and is so adjusted that it requires longer to operate than the length'oi time required to receive an incoming code combination; Some time during the incoming code combination after manual key l8 has been operated, relay III will operate to its spacing position and thereupon complete a circuit for the operation of relay is from battery through armature and spacing contact of relay l0 and the winding of of key I.

2 L relay It to ground through operated contacts Relay I! thereupon operates and completes acircuit for maintaining itsel! operated under. control of key Ii.

, h The operation 01' relay I! in addition inter-- 'rupts the operating circuit of relay l8 and thus prevents relay "from operating at this time.

Consequently, the operation of the manual feed-out key Ii at a time during which signals are being received is ineffective to operate relay l and is thus inefleetive to interfere with the lay I8.

reception or the signals and the repeating of I these signals by a line relay In to the selector.

magnet I! through the break contacts or re- However, if during other periods an operator wishes to cause machine II to automatically advance'or feed-out the tape, key 16 upon operapletes anobvious circuit for the operation or 'relayll.

In addition, the oporationoi. relay iitransiersthe-circuit'ot thesele'ctor. magnet I! from the marking contact-of. the line relay ll'to the signal generator ll which'in the exemplary embodiment or the present invention continuously generates the letters signals; of course, any other suitabl or desirable code-combination or other type of signals may be transmitted 'by the permutation 'codetransmitter it so -longas the signals 80 generated cause the recording device II to advance the record medium therethrough.

So long as key "is held operated and no signals are received, the above described-circuit from the letters signal generator. II to the selector mag-*- able manner. I

Upon the release of key It, relay B will release bodiment of the present invention it is desired that relay have a release time only very slightly shorter than the time required to receive an entire code combination. Hence, near the end of the first code combination received over line L relay ll will release and render eiiective the connection between the selector magnet l2 and the contacts of the line or repeating relay Ill. Thereafter, the signals will be repeated to the selector magnetin the usual manner and in turn the selector will record and receive signals either by printing them on the. recording medium or by perforating the recording medium in accordance with the received signals or in any other suitand restore the circuit to a normal operating net I! will bemaintained and the magnet will cause the receiving mechanism to advance the recording medium through the device independ ently of'received" signals so that the last entire message maybe either retransmitted or detached iromthe" machinejby the operator and then sent over some other circuit direct to the addressee in any suitable manner.-'Upo'n the release of key ll,'relays l5 and M will in turn releaseand restore the systemto'its idle condition. However, if signals are received during the time key It isheld operated and relay I5 is op-- erated, the first break or start pulse of the first code combination received over line L when repeated by relay ID will complete a circuit iorthe operation of relay l3. Relay l3 thereupon locks operated under control of key l6. I

The operation-of relay i3 in addition interrupts-the operating circuit for the slow-operate relay 15 which relay thereupon releases and interrupts the connection from the letters signal generator l 8 to the selector magnet l2.

Due to, the fact that a slow-release relay I4 is maintained operated during the time the slow operate relay I5 is operated, the slow-release relay 14 will maintain the selector magnet ll! of recorder iloperated 'during a short interval of time-after relay l5 '.eleases.- Consequently, magcondition.

The exemplary embodiment of the invention set forth herein shows two time delay devices or relays I4 and 15. These devices are shown as electromagnetic relays for convenience of the understanding of the present invention. It will be readily understood and appreciated by persons skilled in the art that these relays may comprise a plurality of relays or they may comprise other types of time delay devicessuch as an electron tube controlled by-the charging or discharging time of a condenser. Likewise, these relays may represent any other suitable time delay apparatus for securing the necessary or desired time interval.

What is claimed is:

1. In combination, a telegraph receiver for recording telegraph signals on a record medium, a

received during the time said predetermined signals are supplied to said magnet.

2. In combination, a telegraph reperforator for perforating a recording medium in accordance with received telegraph signals, a magnet for controlling said reperforator, apparatus for transmitting signals to said magnet, a source of predetermined feed-out signals for causing said reperiorator to feed out said record medium independently of received signals, manually controlled connections for connecting said source to said magnet, apparatus responsive to received signals for interrupting saidconnection, and time delay equipment operative incident to the operationof'said last mentioned apparatus for preventing the transmission of the first received signal to saidmagnet, but causing the correct reception of succeeding received signals.

EDWARD F. WATSON. 

